Employee Benefit Plans Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Minimum Years Of Age	18
Minimum Service Requirement	90
Defined Contribution Plan, Cost Recognized	$ 1,200	$ 1,200	$ 883
Defined Contribuition Plan Percentage Minimum Foreign Employees	3.00%
Defined Contribuition Plan Percentage Maximum Foreign Employees	36.00%
Defined Contribuition Plan Percentage Minimum Foreign Management	10.00%
Defined Contribution Plan Foreign, Cost Recognized	$ 469	$ 565	$ 550